Extinct species of Tabulata

Name(s): 
Extinct species of Tabulate corals
Nature 
***.
Background 
Tabulate corals occur in the limestones and calcareous shales of the Ordovician and Silurian periods, often forming low cushions or branching masses alongside Rugose corals.
Incidence 
Tabulate corals began to decline during the middle of the Silurian period, finally becoming extinct at the end of the Permian period.
Type 
(E) Emanations of other problems